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Some of the Sahabah dishonestly accused Aisha of fornication!! This event is clearly mentioned in the Holy Quran: Surah Noor, Ayah 11. For authentic references from the books of Ahl al-Sunnah, see the following:
1. Sahih Bukhari Volume 5 hadith number 462, Chapter al Maghazi (Expeditions)
2. Sunan Nisai Volume 4 page 162 "Kitab Hudood"
3. Fatah ul Bari Volume 5 page 273 "Kitab Shahadath"
4. Irhsad al Sari Sharh Bukhari Volume 4 page 494 "Kitab Shahadath"
5. Nawawi's Sharh Muslim, Volume page 364 "Kitab Tauba"
6. al Bidayah al Nihaya by Ibn Kathir on page 160 Volume 4, Chapter "Dhir Ifk"
7. Tafsir Mazhari commentary of Surah Nur Volume 17 page 479
8. Tafsir Kabeer Volume 6 page 240 Surah Nur
9. Tafsir Fatah ul Qadeer Volume 5 page 49 Surah Nur
10. Umdah al Qari fi Sharh Sahih Bukhari, Volume 6 page 90
11. Sirat un Nabi by Ibn Hisham, chapter 137 (the event of Ifik) page 360
This is how the event is narrated in Sahih Bukhari Volume 5 hadith number 462:
Whenever Allah's Apostle intended to go on a journey, he used to draw lots amongst his wives, and Allah's Apostle used to take with him the one on whom lot fell. He drew lots amongst us during one of the Ghazwat which he fought. The lot fell on me and so I proceeded with Allah's Apostle after Allah's order of veiling (the women) had been revealed. I was carried (on the back of a camel) in my howdah and carried down while still in it (when we came to a halt). So we went on till Allah's Apostle had finished from that Ghazwa of his and returned. When we approached the city of Medina he announced at night that it was time for departure. So when they announced the news of departure, I got up and went away from the army camps, and after finishing from the call of nature, I came back to my riding animal. I touched my chest to find that my necklace which was made of Zifar beads (i.e. Yemenite beads partly black and partly white) was missing. So I returned to look for my necklace and my search for it detained me. (In the meanwhile) the people who used to carry me on my camel, came and took my howdah and put it on the back of my camel on which I used to ride, as they considered that I was in it. In those days women were light in weight for they did not get fat, and flesh did not cover their bodies in abundance as they used to eat only a little food. Those people therefore, disregarded the lightness of the howdah while lifting and carrying it; and at that time I was still a young girl. They made the camel rise and all of them left (along with it). I found my necklace after the army had gone.
Then I came to their camping place to find no call maker of them, nor one who would respond to the call. So I intended to go to the place where I used to stay, thinking that they would miss me and come back to me (in my search). While I was sitting in my resting place, I was overwhelmed by sleep and slept. Safwan bin Al-Muattal As-Sulami Adh-Dhakwani was behind the army. When he reached my place in the morning, he saw the figure of a sleeping person and he recognized me on seeing me as he had seen me before the order of compulsory veiling (was prescribed). So I woke up when he recited Istirja' (i.e. "Inna lillahi wa inna llaihi raji'un") as soon as he recognized me. I veiled my face with my head cover at once, and by Allah, we did not speak a single word, and I did not hear him saying any word besides his Istirja'. He dismounted from his camel and made it kneel down, putting his leg on its front legs and then I got up and rode on it. Then he set out leading the camel that was carrying me till we overtook the army in the extreme heat of midday while they were at a halt (taking a rest). (Because of the event) some people brought destruction upon themselves and the one who spread the Ifk (i.e. slander) more, was 'Abdullah bin Ubai Ibn Salul."
(Urwa said, "The people propagated the slander and talked about it in his (i.e. 'Abdullah's) presence and he confirmed it and listened to it and asked about it to let it prevail." Urwa also added, "None was mentioned as members of the slanderous group besides ('Abdullah) except Hassan bin Thabit and Mistah bin Uthatha and Hamna bint Jahsh along with others about whom I have no knowledge, but they were a group as Allah said. It is said that the one who carried most of the slander was 'Abdullah bin Ubai bin Salul." Urwa added, "'Aisha disliked to have Hassan abused in her presence and she used to say, 'It was he who said: My father and his (i.e. my father's) father and my honor are all for the protection of Muhammad's honor from you.").
Ibn Kathir in al Bidayah al Nihaya, Volume 4 page 160 writes the following:
"Then he (prophet) went to the people and addressed and then recited what Allah revealed in Quran, then he ordered that Mastah bin Uthatha, Hasaan bin thabit, Hamna bint Jahsh to be punished because they were among those who spread the allegation of adultery."
Here, the Companions lied. That is slander. But, here, we tell the truth from your own books. It’s completely different. This is called research.